OK, a couple of things ...

First of all, I guess I'm old, very particular, or both, because I did not see a smokin' hot chick in that video ...

Now, about the unit - I can see it being used in some venues, especially if it is to augment the sound of a 2 - 3 piece group. It certainly seems to have a lot of good features, for someone who does not want to - or cannot - transport a keyboard around.
Of course the video was staged, but I found it interesting that the people in the background were socializing, and not really dancing - but I guess if this 'box' were hooked up to a good PA system with a thumping bass, people would dance.

As for tracks vs 'live' music, again it depends on the venue ... I think we all have seen dance clubs with DJs and crowded dance floors - well, is this any different? If people are going out to dance, as long as the music is stuff they know, is loud, and is thumping, they will dance ...

However, if I am going to see a vocalist or musician perform, do I want them performing to backing tracks all night? I don't think so - BUT, that being said, I have seen those three young, great Italian singers - "Il VOLO" live in concert with an orchestra of about 16 players, and yet each one of them did one solo each to a backing track of a full symphony orchestra and singers.

As for the gigs many of us on this board play - NH/AL/Sr Centers, etc. those audiences do not care if we are playing an instrument or not. What they want is to be 'entertained'. I work gigs as a soloist with my KORG Pa900 and I also work gigs with a female vocalist using only 'backing tracks'. When we work one of those gigs, do people come up and say "OH, you didn't play any instruments" ? NO!!! they come up and say things like "we love your voices", "You two sing so well together", "We love your singing, especially the duets", etc. etc., etc. ...
At a couple of AL places I work, I am one of the very few who actually plays an instrument - even though I know that some of the other performers play keys, or guitar very well. They just don't want to go through the trouble of transporting and setting up additional equipment.
I also find, that performing strictly as a vocalist using 'backing tracks', I have a certain amount of 'freedom' as an "entertainer", while performing with the keyboard gives me a different 'freedom' to express myself as a "musician".

Now, as far as the future of music goes, the entertainment section of our newspaper on Thursday is filled with listings of what musician/singer/band is playing where (and chas, there are a good number of Jazz venues also). Now some of these 'acts' are 'tributes' where a guy does a Buble act, or another does Sinatra, or another does Dean Martin, all using 'backing tracks, but for the most part there are good musicians playing their instruments, so I am fairly confident that 'live' music will be around for a while yet ...
And as long as I am still around doing what I do, while I really enjoy being a 'vocalist', I will prefer to perform with my keyboard ...